Body form is up to the artist making the figure. You can adjust that with body morphs (morphs++ for V4) or with aftermarket morphs. Biala has a variety of breast morphs for G3 & G8. I suggest using the Francesca body as a starting point for V4 figures. You might also try a teen body. They're often more petite. Bodies are malleable. You may have to make adjustments to get what you want.